Artificial hand.



B. BOWLER.

ARTIFICIAL HAND.

APPLICATION man Fsmzs, Isle. 4

Patented Apr. 22,1919.

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ARTIFICIAL HAND.

weier.

To all whom t may concern.'

Be it known that I, BAR'rI-IoLoMEw Bow- LER, of the city of Toronto, inthe county of York, Province of Ontario, Canada, a subject of the Kingof Great Britain, have invented certain new and useful Improvements inArticial Hands, of which the following is a specification.

This invention relates to the hand shown and described in my priorUnited States application No. 277,818, dated February 18, 1919, and myobject is to improve the constructions employed for rotarily adjustingthe hand on the arm member and for adjusting the hand to one side or theother of thev axis of the arm member. It is more particularly my objectto so design these parts that they are more easily and cheaply madewhile possessing equal or greater eiciency than the parts they replace.`

I attain my object by means of the constructions hereinafter describedand illustrated in the accompanying drawings in which Y lFigure 1 is anelevation of my improved hand connected to an artiiicial arm member;

Fig. 2 a similar view, partly in section, taken at right angles to Fig.1;

' Fig. 3 a longitudinal section of the connection between the handmember and the arm member;

Fig. 4 a plan view of the end plate and adjusting plate of the armmember;

Fig. 5 a partial longitudinal section on an enlarged scale of theconnection between the hand and arm members; and

Fig. 6 a view similar to Fig. 5 showing a slight modification.

In the drawings like numerals of reference indicate corresponding partsin the different figures.

1 is an artificial arm member of ordinary construction adapted to belaced to a stump. The end of the arm member is formed a flat metal plate2, to which the hand member is connected. The hand member is providedfor the purpose with a boss 3 having a threaded hole formed thereinadapted to screw on to the threaded upper end of the pin 4. This pin 4has a head 5 formed at its lower end and is rotatable in the end plate2. On the end plate is superimposed an ad- 'usting plate6, which has afiat sided hole formed therein (see Fig. 4) which engages acorrespondingly shaped part 8 of the pin 4. The adjusting plate willthus serve to Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed February 25, 1919. Serial No. 279 .069.

rotatethe pin 4 in the plate 2, while the plate 2 is itself free toslide suiiiciently longitudinally of the ypin to permit the boss 3 to bescrewed down tight on the end of the pin to jam the adjusting plate andthe end plate together. The threaded end of the pin 4 is somewhat largerthan the remainder of the pin so that the pin remains in position in theplates 2 and 6 when the boss is unscrewed. l

The purpose of this construction is to enable the hand member to berotarily adjusted on thearm member. It ywill be observed that whentheboss 3 is clamped in place, it always assumes a certain positionrelative to the plate 6, so that by turning the plate 6 (when the partsare loose) to any desired position, the position of the hand member willalso be found to be changed when it is screwedtightly in position.

I find it preferable to provide frictional means tending to resist theturning of the adjusting plate 6 on the end plate 2. For this purpose Imay provide what is commonly called click mechanism, as shown in -Fig 5,or plates 9 of fiber or other frietional material as shown in Fig. 6.

In Figs. 3, 4 and 5 I show a spring actuated ball 10 supported by aholder 11 to operate through an opening in the end plate 2. A pluralityof small holes 12 are formed in the adjusting plate 6 concentric withthe pin 4 and in position to consecutively engage the ball 10. The ball,when engaging r a hole, yieldingly resists movement of the adjustingplate. while the sound of the click indicates to the user when the platehas been adjusted through an angle corresponding to one or more holes.the adjusting plate to facilitate its rotary adjustment.

The boss 3 is provided with the jaws 14, between which is pivoted theshank 15 of the hook 16. The hook is thus adapted to swing on an axis atright angles to an aXis longitudinal of the arm on which the boss 3turns. It will be noted that the axis on which the shank is pivoted liessubstantially in the same plane as the hook. The pivot pin on the shankpasses through both jaws 14 and the shank and is suitably set up with anut.

To adjust the angle of the hook as indicated particularly in Fig. 2, Iprovide a latch 18 pivoted. in a slot formed in the shank 15 and adaptedto engage any one of the notches 19 of a quadrant formed on one A lug 13is provided on of the jaws 14. A, spring 2O engagingthe latch and theshank provides means tending to hold the latch in engagement with thenotches.

The hook is constructed substantially as in the prior patenthereinbeforereferred to. The hook is double and the parts of each half remote fromthe shank are substantial-ly arcshaped as shown. The center from whichthe arc is struck vis located in the shank, preferably near the outerend thereof.

Between the halves of the hook is :pivoted a clamp arm 21, `which is`preferably formed of resilient metal and is curved in thedirection ofits length as shown. To adjustably connect the clamp arm to thearc-shaped parts of the hook, I Lprovide a dog 522 4pivoted on the clamparmand normally pressed by a spring 23 to engage the teeth of a-rack 24,preferably a ratchet rack, formediinfth'e outer side offthe arc-shapedpartiofeach half of the hook. rThe arm is thus easily vswung to pressagainst the outer side of anyf'object.

with which the `hook unay be engaged Vand releasably held as moved.

What I claim as my invention is:

l. The combination of a hand provided with a boss for attachment toanarticial arm member; jaws `formed onlsaid boss; a hook member having ashank -iitted between said jaws; a ypivot pin passing through said jawsand shank, theshank above the pivot pia beingaiviaed of snaai; a mail'pivoted in the shank, a notched quadrant being formedl on one of `thejaws with which said latch is ,adapted to engage; and a spring en- Yplate superimposed A'on theend plate, `Said adjusting pl-ate beinglooseon but having-ia rotative fengagement with the pin.; :and fa handfmember provided v.with 1.a boss 'adapted to screw fon theapin 4and jamthe adjusting plate and end plate together. v

Am artificial arm ymember providedat its lend .with-,a flat plate.; acentral lipin rotatably connedtetl with said `plate and provided with athreaded (outer, end; an adjusting platesuperimposed'on theendiplatesaidadjusting :plate :being loosefon but lhaving `v`airotativeengafgement with the pin; iazcliclndevice -yieldinglyretainingthe adjusting plate l in any predetermined position to whichvit fis turned andra hand :member :provided with 3a boss Iadapted toscrew lon the pin-and jam the adjustingplate andend plate together.Signed at the city of Toronto this rl9th day of Feb., 1919. 4 I jBARTLHQLOMENV BQNVL'ER.

Copies of `this patentrmay be'obtalned. -for :,ve cents each,`by.adressingthe Commissioner of Pateta i i yWashington,1h01

